/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.dataset;

import static org.hisp.dhis.category.CategoryCombo.DEFAULT_CATEGORY_COMBO_NAME;

import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import lombok.RequiredArgsConstructor;
import org.hisp.dhis.category.CategoryCombo;
import org.hisp.dhis.category.CategoryService;
import org.hisp.dhis.dataapproval.DataApprovalWorkflow;
import org.hisp.dhis.dataelement.DataElement;
import org.hisp.dhis.dataentryform.DataEntryForm;
import org.hisp.dhis.indicator.Indicator;
import org.hisp.dhis.legend.LegendSet;
import org.hisp.dhis.organisationunit.OrganisationUnit;
import org.hisp.dhis.system.deletion.IdObjectDeletionHandler;
import org.springframework.stereotype.Component;

/**
 * @author Lars Helge Overland
 */
@Component
@RequiredArgsConstructor
public class DataSetDeletionHandler extends IdObjectDeletionHandler<DataSet> {
  private final DataSetService dataSetService;

  private final CategoryService categoryService;

  @Override
  protected void registerHandler() {
    whenDeleting(DataElement.class, this::deleteDataElement);
    whenDeleting(Indicator.class, this::deleteIndicator);
    whenDeleting(Section.class, this::deleteSection);
    whenDeleting(LegendSet.class, this::deleteLegendSet);
    whenDeleting(CategoryCombo.class, this::deleteCategoryCombo);
    whenDeleting(OrganisationUnit.class, this::deleteOrganisationUnit);
    whenDeleting(DataEntryForm.class, this::deleteDataEntryForm);
    whenDeleting(DataApprovalWorkflow.class, this::deleteDataApprovalWorkflow);
  }

  private void deleteDataElement(DataElement dataElement) {
    Iterator<DataSetElement> elements = dataElement.getDataSetElements().iterator();

    while (elements.hasNext()) {
      DataSetElement element = elements.next();
      elements.remove();

      dataElement.removeDataSetElement(element);
      idObjectManager.updateNoAcl(element.getDataSet());
    }

    List<DataSet> dataSets = idObjectManager.getAllNoAcl(DataSet.class);

    for (DataSet dataSet : dataSets) {
      if (dataSet
          .getCompulsoryDataElementOperands()
          .removeIf(operand -> operand.getDataElement().equals(dataElement))) {
        idObjectManager.updateNoAcl(dataSet);
      }
    }
  }

  private void deleteIndicator(Indicator indicator) {
    for (DataSet dataSet : indicator.getDataSets()) {
      dataSet.getIndicators().remove(indicator);
      idObjectManager.updateNoAcl(dataSet);
    }
  }

  private void deleteSection(Section section) {
    DataSet dataSet = section.getDataSet();

    if (dataSet != null) {
      dataSet.getSections().remove(section);
      idObjectManager.updateNoAcl(dataSet);
    }
  }

  private void deleteLegendSet(LegendSet legendSet) {
    for (DataSet ds : idObjectManager.getAllNoAcl(DataSet.class)) {
      Iterator<LegendSet> lsIterator = ds.getLegendSets().iterator();
      while (lsIterator.hasNext()) {
        if (legendSet.equals(lsIterator.next())) {
          lsIterator.remove();
          idObjectManager.updateNoAcl(ds);
        }
      }
    }
  }

  private void deleteCategoryCombo(CategoryCombo categoryCombo) {
    CategoryCombo defaultCategoryCombo =
        categoryService.getCategoryComboByName(DEFAULT_CATEGORY_COMBO_NAME);

    Collection<DataSet> dataSets = idObjectManager.getAllNoAcl(DataSet.class);

    for (DataSet dataSet : dataSets) {
      if (dataSet != null && categoryCombo.equals(dataSet.getCategoryCombo())) {
        dataSet.setCategoryCombo(defaultCategoryCombo);
        idObjectManager.updateNoAcl(dataSet);
      }
    }
  }

  private void deleteOrganisationUnit(OrganisationUnit unit) {
    for (DataSet dataSet : unit.getDataSets()) {
      dataSet.getSources().remove(unit);
      idObjectManager.updateNoAcl(dataSet);
    }
  }

  private void deleteDataEntryForm(DataEntryForm dataEntryForm) {
    List<DataSet> associatedDataSets = dataSetService.getDataSetsByDataEntryForm(dataEntryForm);

    for (DataSet dataSet : associatedDataSets) {
      dataSet.setDataEntryForm(null);
      idObjectManager.updateNoAcl(dataSet);
    }
  }

  private void deleteDataApprovalWorkflow(DataApprovalWorkflow workflow) {
    for (DataSet dataSet : workflow.getDataSets()) {
      dataSet.setWorkflow(null);
      idObjectManager.updateNoAcl(dataSet);
    }
  }
}
